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<== Date ==> <== Thread ==>

Subject: RE: Simple ADC - Ethernet device?
From: "Szalata, Zenon M." <zms@slac.stanford.edu>
To: Paul Nord <Paul.Nord@valpo.edu>, "tech-talk@aps.anl.gov" <tech-talk@aps.anl.gov>
Date: Tue, 27 Sep 2011 08:50:21 -0700
At SLAC we use Beckhoff Field Bus devices.  A typical set would consist of BK9000, KL3102, and KL9010.
BK9000 is the Ethernet coupler, KL3102 is a two channel differential input analog module (-10V to +10V), and KL9010 is a terminator.  These are not expensive.  The BK9000 uses Modbus protocol.  Beckhoff has a large array of Field Bus products.

I am using Modbus driver written by Mark Rivers.  A soft IOC consists of the afore mentioned driver, a handful of EPICS records, and configuration specified in the st.cmd file.

Zen

> -----Original Message-----
> From: tech-talk-bounces@aps.anl.gov [mailto:tech-talk-bounces@aps.anl.gov]
> On Behalf Of Paul Nord
> Sent: Tuesday, September 27, 2011 7:38 AM
> To: tech-talk@aps.anl.gov
> Subject: Simple ADC - Ethernet device?
> 
> I need to monitor the pressure in a gas supply bottle.  We expect to need to
> change gas bottles every few days and we'd like to alert the detector operators
> in plenty of time.
> 
> Getting a transducer to produce a voltage is simple enough.  I'm a little unclear
> about the next step: digitizing that voltage and getting that information to our
> EPICS softIOC.  I'd like a simple box that connects to the voltage and also to an
> ethernet port.
> 
> There is an Epics driver for the environment monitor Websensor from
> Esensors Inc.  It monitors temperature, humidity, and illumination.  The device
> can also monitor a voltage reading.  I presume it would be easy modify the
> driver to also get the voltage reading.
> 
> 
> Is there another ethernet-based ADC that you would recommend?
> 
> There are some nice USB devices.  But I don't really want to setup a computer
> just to monitor one voltage remotely.
> 
> I found some nice modular systems from Omega and NI.  Alas, there are no
> Epics drivers.
> 
> Paul


References:
Simple ADC - Ethernet device? Paul Nord

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